Social bonds, social status and survival in wild baboons: a tale of two sexes
Campos, Fernando et al. (2020), Social bonds, social status and survival in wild baboons: a tale of two sexes, Dryad, Dataset, https://doi.org/10.5061/dryad.kh189322b
People who are more socially integrated or have higher socio-economic status live longer. Recent studies in nonhuman primates show striking convergences with this human pattern: female primates with more social partners, stronger social bonds or higher dominance rank all lead longer lives. However, it remains unclear whether social environments also predict survival in male nonhuman primates, as it does in men. This gap persists because, in most primates, males disperse among social groups, resulting in many males who disappear with unknown fate and have unknown dates of birth. We present a Bayesian model to estimate the effects of time-varying social covariates on age-specific adult mortality in both sexes of wild baboons. We compare how the survival trajectories of both sexes are linked to social bonds and social status over the life. We find that, parallel to females, male baboons who are more strongly bonded to females have longer lifespans. However, males with higher dominance rank for their age appear to have shorter lifespans. This finding brings new understanding to the adaptive significance of heterosexual social bonds for male baboons: in addition to protecting the male’s offspring from infanticide, these bonds may have direct benefits to males themselves.
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National Institutes of Health, Award: P01 AG031719
National Institutes of Health, Award: R01 AG053308
National Institutes of Health, Award: R01 AG053330
National Science Foundation, Award: IOS 1456832